My factory nav on my '00 4.4i has a dead screen. I am thinking about replacing it with the Pioneer AVIC-Z2 with all the options. Will this be difficult to do in this vehicle or should I look at some other options (i.e. either fixing NAV screen or replacing current unit, or replacing unit with newer OEM model?) Will I be screwing up theft codes or removing any vital CPU's from the vehicle?

http://www.crutchfield.com/S-JAYyPtc...sp?i=130AVICZ2